I liked the DP move; wish I had gotten that far in looking around prior to finding the funny AIC. However, I have been calling your pattern a 6-cell aur. So, I guess I need the formal definition of a BUG-Lite.

Also, I (and possibily others on this forum) am not familiar with the concept of quantum as you used in your alternative solution and am not able to understand your deletion. Please provide some references to this concept.

I liked the DP move [...] However, I have been calling your pattern a 6-cell aur. So, I guess I need the formal definition of a BUG-Lite.

I suspect you're aware of sudopedia's BUG-Lite page which contains a link to Myth Jellies' seminal thread Between Uniqueness and BUG: BUG Lite. I don't see any BUG-Lite examples there which use only two-digit values, so I understand how you might reach that POV. However, such two-digit examples are shown on RW's Layered Bug-lite thread. Besides, as peterj wrote, a 6-cell pattern is not a rectangle.

tlanglet wrote:

Also, I (and possibily others on this forum) am not familiar with the concept of quantum as you used in your alternative solution and am not able to understand your deletion. Please provide some references to this concept.

There's nothing difficult or mysterious here. 'Quantum' simply refers to two or more cells behaving as one. This occurs with every UR Type 3 and the principle can be extended to any other uniqueness pattern. Above, in the qnt(123)r2489c3 above, there are four cells involved in the triple ... with the two-cell r49c3 of the uniqueness pattern behaving like one. Just think of (123)r49c3 as one cell.

The 'quantum' term, as applied to the UR Type 3, was first coined by MadOverlord ( http://forum.enjoysudoku.com/post12309.html#p12309 ). It has been used infrequently since and perhaps mostly by me. Unfortunately, most of those usages were lost with the disk crash on the Players' Forums.